Kristan Posted October 15, 2007 Report Share Posted October 15, 2007 Hi all, I have a strange problem with an installation of PBXnSIP. The customer is complaining of audio cutting out on some calls, and sure enough they are right. I started a wireshark capture and luckily enough managed to get a conversation with a break up almost straight away. The setup is: ISDN-> Parlay ISDN Gateway --- SIP/RTP ---> PBXnSIP --- SIP/RTP----> phones From the streams, the breakup appears to be due to the PBX not sending RTP traffic. At the time of the breakup, between the parlay and the PBX I can see a steady stream of RTP going TO the PBX, but nothing FROM it. At the same time, between the phone and the PBX, I can see traffic FROM the phone, but nothing TO it. It's like the PBX just decides to stop sending RTP, then carries on again. The duration of the break is about 8 seconds. There was also another call in progress, same as above, but terminating at our SIP trunk instead of the ISDN gateway, which also sufference idential loss for exactly the same period of time. It doesn't appear to be network related, as I can see both sides of each stream arriving at the PBX, they just don't get passed through, it's like the PBX just stops for 8 seconds, then starts again. Is there anything that would cause this? Quote Link to comment Share on other sites More sharing options...
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